Thanks for the response. This is my first try at modifying a plug in so I might have done something wrong. I did as you asked and saw no change at all.

I'll tell you what I did step by step so you can perhaps spot a mistake I made. I copied the original file to a folder I created called copy. I then opened the js/kgvid_video_embed.js file using the code editor and found the line: function kgvid_setup_video(id) {

I copied your code piece and pasted it in the line directly after the line you specified. I saved the file, and then went to the wordpress editor and made a new post with a video.

I saw no change.

I then removed the line and saved so I am back to normal. Again, no change.

Did I do things correctly and if so, is this probably impossible? I do think simply turning off the right click is enough, but also, I have seen video players that do not allow copying. There must be a way to turn off the right click, but your suggestion seemed not to do that.